用C语言制作计算器菜单

好的，下面是用C语言制作计算器菜单的示例代码：

#include <stdio.h>

int main() {
    int choice;
    float num1, num2;
    
    printf("Calculator Menu\n");
    printf("1. Addition\n");
    printf("2. Subtraction\n");
    printf("3. Multiplication\n");
    printf("4. Division\n");
    printf("Enter your choice (1-4): ");
    scanf("%d", &choice);
    
    switch(choice) {
        case 1:
            printf("Enter two numbers: ");
            scanf("%f %f", &num1, &num2);
            printf("%.2f + %.2f = %.2f", num1, num2, num1+num2);
            break;
        case 2:
            printf("Enter two numbers: ");
            scanf("%f %f", &num1, &num2);
            printf("%.2f - %.2f = %.2f", num1, num2, num1-num2);
            break;
        case 3:
            printf("Enter two numbers: ");
            scanf("%f %f", &num1, &num2);
            printf("%.2f * %.2f = %.2f", num1, num2, num1*num2);
            break;
        case 4:
            printf("Enter two numbers: ");
            scanf("%f %f", &num1, &num2);
            if(num2 == 0) {
                printf("Error: division by zero");
            } else {
                printf("%.2f / %.2f = %.2f", num1, num2, num1/num2);
            }
            break;
        default:
            printf("Invalid choice");
    }
    
    return 0;
}

这个程序会显示一个计算器菜单，让用户选择需要进行的操作。根据用户的选择，程序会请求用户输入相应的数字，并计算结果。注意程序中的格式化输出语句，它们会将计算结果显示为浮点数，并且保留两位小数。